当呼吸防护口罩损坏、被玷污，或感觉呼吸困难时，请更换呼吸防护口罩。

If the respirator becomes damaged, soiled, or breathing becomes difficult, replace the respirator.

youdao

当呼吸防护口罩损坏、被玷污，或感觉呼吸困难时，请更换呼吸防护口罩。

If the respirator becomes damaged, soiled, or breathing becomes difficult, replace the respirator.

youdao